Lateral Acceleration Limiting Device for Vehicle Lane-Keeping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lane-centering assist systems face challenges in controlling lateral acceleration, which can exceed the 3.0 m/s2 limit, leading to vehicle deviation from the lane on curved roads, necessitating a technology to ensure control performance while adhering to regulatory limits.
Innovation Solution
A lateral acceleration limiting device that calculates current and predicted lateral acceleration, adjusts steering torque, and provides warnings to prevent excessive lateral acceleration, using a processor, controller, and steering torque adjusting device, integrated with navigation and yaw rate sensors to maintain safe lane-keeping within defined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lane-centering assist control is executed with high steering torque to maintain lane position, then lane-keeping performance is improved, but lateral acceleration exceeds the 3.0 m/s2 regulatory limit causing vehicle deviation on curved roads
Solution Approach 1:
The system dynamically adjusts steering torque based on real-time lateral acceleration feedback and predicted lateral acceleration from navigation data. When lateral acceleration approaches the 3.0 m/s2 limit, the system reduces steering torque to maintain compliance, and increases it when safe, creating a dynamic balance between lane-keeping performance and regulatory compliance
Solution Approach 2:
The system uses navigation device data to predict future lateral acceleration before the vehicle encounters curved sections. By anticipating high lateral acceleration zones in advance, the system can proactively reduce steering torque to prevent exceeding the 3.0 m/s2 limit, rather than reacting after the violation occurs
2Object-affected harmful factors
If steering torque is reduced to comply with lateral acceleration limits, then regulatory compliance is improved, but lane-centering control effectiveness deteriorates allowing vehicle deviation
Solution Approach 1:
The system continuously monitors actual lateral acceleration and uses this feedback to adjust steering torque in real-time. The controller receives lateral acceleration data, compares it against the 3.0 m/s2 limit, and automatically modulates steering torque to maintain compliance while preserving lane-centering functionality as much as possible within regulatory constraints
3Object-affected harmful factors
If the system suddenly releases steering control when lateral acceleration exceeds the limit, then regulatory compliance is achieved, but vehicle stability deteriorates causing sudden lane deviation
Solution Approach 1:
Instead of sudden control release, the system implements dynamic, gradual steering torque adjustment. When lateral acceleration exceeds the limit, the controller progressively reduces torque rather than abruptly cutting it, maintaining vehicle stability and predictable behavior while still ensuring regulatory compliance over time
Data Source
AI summary
A lateral acceleration limiting device may include a processor configured to calculate current lateral acceleration of a vehicle, predict forward lateral acceleration, and determine whether the prediction lateral acceleration and the current lateral acceleration are greater than a predetermine reference value, a controller communicatively connected to the processor and configured to determine whether to generate a warning or whether to adjust steering torque, depending on a result determined by the processor, and a steering torque adjusting device communicatively connected to the processor and configured to adjust the steering torque depending on control of the controller.